Osteoprotegerin-Ligand und Osteoprotegerin

 

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Knochengewebe wird kontinuierlich durch einen koordinierten Prozess aus osteoklastärer Resorption und osteoblastärer Bildung erneuert, was zu einem dynamischen Gleichgewicht mit Erhaltung der strukturellen Integrität führt [39]. Einer inadäquat hohen Knochenresorption aufgrund einer gesteigerten Osteoklastenaktivität wird eine zentrale Bedeutung bei der Pathogenese vieler Knochenerkrankungen zugeschrieben, und die Hemmung dieses Prozesses ist ein wichtiges Therapieprinzip [39]. Die Entdeckung und Charakterisierung von Osteoprotegerin-Ligand (OPGL) [2] [27] [47], seines Rezeptors »Receptor activator of nuclear factor-κB« (RANK) [2] und seines Rezeptorantagonisten Osteoprotegerin (OPG) (siehe Glossar, [Tab. 1] [42] haben zu einem neuen, molekularen Konzept der Zellbiologie von Osteoklasten und des Knochenstoffwechsels geführt, in dem diese drei Komponenten eine essentielle Bedeutung einnehmen [18] [44] . In dieser Übersicht stellen wir die Grundlagen und die Regulation von OPGL und OPG durch Zytokine und Hormone dar und diskutieren die klinische Bedeutung dieses Systems für die Pathogenese und Therapie metabolischer Knochenerkrankungen.

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Korrespondenz

Dr. Lorenz C. Hofbauer

Abteilung für Gastroenterologie und EndokrinologieZentrum für Innere MedizinPhilipps-Universität

Baldingerstraße

35033 Marburg

Phone: 06421/286-2742

Fax: 06421/286-8922

Email: hofbauer@post.med.uni-marburg.de